In my opinion that's a little bit tacky. I don't know if I'd like people seeing exactly how I answered every application question a week before applications were due, and I don't think that an application post would be HN-worthy. (Especially not if a bunch of different people all posted theirs at once.)

I'd advise emailing a few people that you think could give you feedback. I sent Garry a rough draft of my application, and his feedback helped a lot. Either write to a few HN people (and don't get upset if some people you write to are really busy right now), or join the IRC channel and ask people there.